* Added method norm2 in class Point
* Changed the abstract class ProabilityMap as part of code refactoring
and improvements (especially the adapted the interface)
* Changed the class ProabilityMapEllitpic as part of code refactoring
and improvements
* Changed the class ProabilityMapPathLoss as part of code refactoring
and improvements
* Added enum RoomMapWeightFunction to distinguish btw exisiting methods
* Changed the class ProbabilityBasedAlgorithm as part of code
refactoring and improvements
* started with new JUnit tests (testing the room map weight functions)
* adaptions